The party was fighting this rich merchant guy that was just loaded down with magic items that he could use to murder us. One player tosses out this bag that makes a cloud of dust that causes him to be incapacitated for like 5 rounds hacking and coughing, while the party takes the time to beat the heck out of him and kill him. Suddenly, party has a bunch of new magic items all for the cost of a very low cost 3rd party alchemical item. Needless to say, this item has been banned by the group since then.

I'm not sure if this counts or not but. we were doing a mech campaign and we were storming a huge battleship we had divided up the jobs and my job was to use my mech's tendrils to take control after everyone else had it destracted. well as it turns out Battle ships have a distinct advantage against a bunch of small to medium sized mechs. it was slaughtering our NPC friends and was probably going to kill a few of our party members. when I started to take control I took the weapons first. That was when I discovered that the battle ship was equipped with drill missiles and one use (per battle) humongous spears that it could shoot out at any time. I set every single one of it's missiles to shoot itself and Fired the spears into the mechs it had launched to combat my friends. for A moment I was worried that I had destroyed our shiny new Battleship.

So I was playing 5th ed and I got the Thunder Boomerang from Princes of the Apocalypse which pretty much does 4d4 on one hit and only 1d4 on later hits.So I used my rogue to use it on top of his regular sneak attack damage and advantage means I could one shot most of the monsters we ewen up against.

This isn't one of mine, but my opponent. Warhammer 40'000, 4th Edition. I was, in admittedly a very low point game for a unit of it's price tag, using a Land Raider against my opponent. A Land Raider has Armor 14 on all sides, the highest a vehicle can have, as well as a dedicated anti-infantry gun and two powerful anti-tank cannons. I was using it as a transport in an urban battleground. On the other end of the road it was going down, a Rhino APC. A transport tank with a weaker Anti-Infantry and, in this case, had been upgraded with the Hunter Killer Missile.

A HKM is basically a One Shot Missle with Infinite Range, but you still need to roll to hit, and it's stuck on Krak Missle (Strength 8, meaning you need a 6 to glance a Land Raider on a D6). Nowadays, even that would just take off a hull point, but this was 4th Edition. I had fired on another tank the turn before, and this one had a regular space marine squad, nothing dangerous, just a Metal Box basically.

His shooting phase. He rolls to hit. He gets a 3, the absolute minimum to hit. Then he rolls a 6, a glancing hit. Now, before I go on, any Warhammer 40K player will tell you in 3rd and 4th edition, a glancing hit would always make you nervous. Because if they rolled a second 6 on the damage chart... they'd get "Vehicle Destroyed". Lo and behold, that's exactly what happened. A quarter of my points wasted.

I stopped using them myself after 4th though. Not for lack of use, but I just stopped playing Imperials, and they're the only ones with HKMs.

Dark Heresy has something called 'Exterminator Packs;' they're disposable single-shot flamethrowers that can be attached to any ranged or melee weapon. I believe they're typically attached to two-handed 'Eviscerator' chainswords by Clerics and Sororitas, but our utility-weapon user (combi-weapon shotgun & grenade launcher, with a Lathe-Forged bayonet) made heavy use of them. Once, when he was stuck soloing a swarm of Necron Scarabs while the rest of us tried to kill the Acanthrite quickly, they swarmed up to him, and he popped the Exterminator cartridge before the swarm could get around his riot shield. It didn't kill them, but it did enough to keep them manageable once we realized the Acanthrite was NOT going down anytime soon and saved him. He wouldn't've survived without constantly parrying with his Lathe-forged bayonet, either; that thing kept getting quick-drawn for parries even after he bought a power fist. Anyway, after that fight I picked up an Exterminator for each of my four sniper rifles, but thankfully never needed them.
Seriously, Necrons are frustrating to fight in the RPGs. They're already relatively tough even when they don't use a C'tan shard to get a burnout-proof power field.

In Necromunda (A GW game woefully underappreciated by GW, and their best small-unit tactics game to date) you can cheaply equip a gang with one-shot flamers. They use a roughly 8-inch teardrop shaped template that ignores cover and does respectable damage. Cover is vital in Necromunda since armor is rare, expensive, and only vaguely effective.

Ladies and gentlemen, allow me to tell you about Raxon's absolute last resort weapon. It is a 1 gauge pistol that fires roughly two pounds of buckshot. The shell is overfilled with an extremely high density explosive, resulting in 3600fps from the three inch barrel.

This gun weights ten pounds. Firing it causes extreme recoil. It will not just break your wrist. It will rip your arm off. Do not fire it two handed, because it WILL kill you when it flies back into your chest and drives your sternum into your heart and lungs.

This gun is named Final Fang. It is literally the last fang he has to bear. After that, he is as helpless as a small child.

It is effectively a one use weapon. I have had it in games before, but I sorta had to size it up a tiny bit to make it just as devastating for my ultramarine.

A friend of mine and I sometimes don't get along well when we roleplay, mostly because he likes to torment his fellow party members along the way. Our friend was having us test his NWoD campaign, and had us both playing mages. Among other things, he gave us access to a series of artefacts which would essentially be one-shot.

In order to continue our investigation, our characters need to speak to the owner of a popular night club. The bouncers won't let us through, and it's at this time that I need to use the bathroom and excuse myself from the room. When I come back, my friend and the GM have big stupid-looking grins on their faces. I find out why approximately 15 seconds later when my character gets thrown into the crowd, starting a massive brawl. Using the brawl to distract the bouncers, he sneaks upstairs. Following a few lucky rolls, I head on after him.

This is where my memory gets kinda fuzzy. I remember we encounter the guy and he turns out to be a vampire. Somehow, my friend gets out in the streets below the building while I'm rifling through his desk with a bodyguard who's been cleaved in half. His character isn't much of a fighter and he kept screaming for me to do something. So I relaxed and waited until the last possible moment before activating one of my artefacts, a flashlight that produced pure sunlight. The vampire disintegrated right before sinking his fangs into my friend. He was suddenly much more amicable after that.

A couple years ago, my DM decided to convert the campaign to GURPS- characters and story from the D&D game were maintained, but with new mechanics. My cleric was permitted to hold on to a single scroll of earthquake during the transition, albeit with new mechanics.
Following our escape from a magical genetic engineering lab, we were travelling through a mountain range. From atop the mountain, we saw a massive eldritch beast about half a day's travel from us. I told my party members to keep going, while I waited for it to get closer. Once it was close enough, I prayed for Pelor's blessing, brought out the scroll, and collapsed an enormous section of the mountain on top of the beast. Drained every one of my FP reserve, but I lived, and the beast did not.

My only use of a one shot was in a one-shot. It was a simple dungeon run and our group was attacked by swarms of centipedes. Most of us were melee fighters and our mage only had one spell worth using on them. Ultimately I had to use my whole flame necklace by taking the biggest bead and throwing at my own feet...onto the rest of the necklace. Turns out 47 aoe Fire damage was a bit overkill and my dwarf was beardless and smelled of burned hair for the rest of the adventur.

We were playing a pathfinder game and our crazy bi-polar sorcerer had gotten these five potions from what later turned out to be a god of magic. We had no idea what they did specifically, but we were able to identify what magic school they were of. This sorcerer was an interesting one in the way that his entire goal in life was to chronicle every single form of immortality. We had just cleaned out a cave of giant frogs when we discovered this pouch that was necessary for one of our party members personal quests and no matter what we did we were unable to open it. This ticked off our knowledge-seeking sorcerer so much that he decided to randomly drink the only potion we allowed him to keep, which turned out to be a potion of necromancy. We start freaking out but the DM assures us that nothing bad will happen and everything should be fine, until he notices that he drew a skull of a dragon on the map. And that is the tale of how a party of level 5 adventurers managed to convince a zombie dragon to help them fight an army of nazi satanists and not eat any of them.

our party was hired to destroy a temple of nerull (evil d&d death god). so my druid bought a few earthquake scrolls, wildshaped into an earth elemental for easy get away and literally brought the house down.

In our most recent Pathfinder Campaign we were travelling various realms of Chaos (our GM loves the Chaositek Book) and found a heavy, massive, lead/something alike covered chest.
We knew at that Point that raw Chaos was EXTREMELY deadly, and assumed correctly what was in that chest.
However later on we hed to run from something Big Bad and Order affiliated (can you spell Duke of Hell ... almost?).
My CHaracter as the only natural Flyer was then taxed with "get the chest and dump it on the huge Devil".
Well, it splintered, raw CHaos met Order, Annihilation met the area (around 3.5 square km) and my CHaracter met 2 more mutations. :/

In a short-lived Savage Worlds campaign, i had my techie use a weapon the GM made, essentialy a 1-shot shotgun pistol he called a "Last Chance", to completely change the course of a battle. basically, i walked up behind the leader of the faction that hired us, and told the GM that i press the last chance against the back of his head and fire. instant death, and the enemy leader spared us AND gave us the right to loot the dead guy's room.

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